If your home is more than 30 years old chances are it harbors some galvanized pipe. While this type of pipe was used primarily for residential water systems, it also was employed in the construction of residential drain, waste and vent systems.

Actually, galvanized pipe is iron that has been coated with zinc to protect it from rust and extend its life. Unfortunately, nothing is forever or at least not with galvanized pipe, as many folks no doubt have discovered.

Copper pipe has been widely used in the last three decades for residential water systems and is by far the leading type nationwide. Various types of plastic have replaced iron pipe for the drain, waste and vent systems in most modern homes. Although not widely, plastic pipe is also being used in lieu of galvanized and copper for residential water systems.